reflectance and transmittance equation

reflectance and transmittance equation

Number 6, 1 SEPI, ESIME, National Polytechnic Institute, Avenida IPN S/N, CP 07738, Mexico Purchase this article from our trusted document delivery partners. This evidence confirms the need to resort to the T-R method for the measurement of particle samples of detritus-rich coastal waters. Arbones, B., Figueiras, F. G. and Zapata, M. (, Berthon, J.-F., Dowell, M., Hoepffner, N. and Grossi, S. (. The reflection and transmission of finite inhomogeneous layers are considered. The filter-retained samples were measured by theT-R method, yielding optical density values ranging from ODs(750) = 0.038 to ODs(400) = 0.230. At higher ODsus values, the error is dominated by the uncertainty of the numerical constants of equation (10) and increases with ODsus, reaching σ ~ 0.027 at the upper limit of the ODsus range considered (i.e. fraction of impinging light that is transmitted (dimensionless), Reflectance, i.e. How the value change as the concentration is increased. Then the fresh ‘reference’ filter is measured with the same geometry used for the particle sample measurement, yielding the ratio ρTr. For corporate researchers we can also follow up directly with your R&D manager, or the information M-1, M-2, etc., are the differences between the mean optical density and the optical densities measured for the nominally equal samples numbered from 1 to 4. Because of the thickness of the GF/F filter and quartz support plate, a fraction of the light scattered in the forward hemisphere by the fiber-glass does not enter through the integrating sphere port. if it causes a significant change in the particle size distribution. The parameter that is measured by all spectroradiometers is the biconical reflectance or alternatively the biconical transmittance. RIS. M-1, M-2, etc. Figure 3 shows the estimate of the error caused by the use of equations (8) and (9), instead of equations (4) and (5), which is the error due to the fact that the transmittance and the reflectance of the ‘reference’ filter and of theparticle-retaining filter are not the same. The fact that this value is significantly lower than that (σ = 0.004) computed from the dispersion of the (Tf + Rf) spectra of Figure 2C proves that the assumption made is correct. CIE L*a*b* data with an accurate representation of the colour of the tea. The departure of the mean optical density ratio yielded by the T method from the nominal concentration ratio (i.e. The experimental routine was followed with considerable care. A similar sensitivity analysis of the chemical oxidation procedure for cancellation of pigment absorption, which was proposed as an alternative to the standard methanol extraction technique (Kishino et al., 1985) in the same paper (Tassan and Ferrari, 1995a), has already been published (Ferrari and Tassan, 1999). Schematic view of the integrating sphere set-up. The validity range of the experimental (ODsus versus ODs) correlation has been shown to extend to ODs = 0.75. Main Difference – Absorbance vs. Transmittance. original sample) and detrital (i.e. Unfortunately, the measurement of this sample could not be repeated and the cause of the anomaly was not identified. In fact, depigmentation may modify the scattering of light by phytoplankton, e.g. The reader interested in comparing the T-R method to other available techniques for measuring light absorption by aquatic particles is referred to Tassan et al. TOT, original sample; DET, depigmented sample; PIG, pigment (obtained by subtracting the DET spectrum from the TOT spectrum). The modifications of the original T-R procedure outlined in Section 2.2 suggested the performance of additional reliability tests of the method. Figure 6 shows the plots versus wavelength of the suspension optical density ratios (10 ml sample/2 ml sample) measured by the T and T-R methods, as well as of the ratio of the directly measured optical densities of the suspension (labeled T, T-R and SUSP, respectively). – Measure a fresh ‘reference’ filter with the same geometry used for the particle sample measurement: the result of the measurement is the ratio ρRr. So, high the value of percentage transmittance gives higher the transparency of the material. The value of ODtr(750) relative to ODtr(400) is high, i.e. In reality, it is not exactly so, for several reasons (differences among filters, in the amount of water absorbed, etc.). However, its advantage is the simultaneous description of the material's reflection properties for all possible directional distributions of incident radiation, whereas the radiance coefficient generally is valid for just one specific directional distribution of incident radiation. Reproducibility of optical density spectra measured by the T-R method. In order to calculate the reflectance and the transmittance of the investigeted optical system, we implemented a computer algorithm which realizes the 4×4 matrix method. The transmittance of a surface or material is defined as the part of the light that moves through the other side of the surface. Sturm–Liouville equations. The similarity of the OD spectra for pigment obtained by the T and T-R methods, even in the presence of large detritus absorption, is an indication that in this case scattering was not modified by NaClO bleaching. The closeness of the mean ratios for the T-R and SUSP data (5.05/5.02 = 1.006) is an indirect proof of the accuracy of the empirical T-R absorption amplification factor. Mexico, 3 Department of Mathematics, CINVESTAV del IPN, Campus Querétaro, Apartado Postal – Place the filter on the sample holder side facing the beam, with concave face against the beam and fiber mesh vertical. Equation (18) is also reported in this paper as equation (10). A synopsis of the T-R routine now in use is presented in the Appendix. – Dual-beam spectrophotometer UV-Vis. These results were confirmed by the experimental evidence that pigment absorption spectra obtained by the T-R and T methods, with depigmentation by NaClO, are by and large in good agreement, i.e. The corresponding 1% loss of reflected light practically cancels out the scattering loss of the ‘reference’ filter measured in the reflection mode.

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